import turtle
import time

boxsize = 200
caught = False
score = 0

def up():
    mouse.forward(10)
    checkbound()

def left():
    mouse.left(45)

def right():
    mouse.right(45)

def back():
    mouse.backward(10)
    checkbound()

def quitTurtles():
    window.bye()

def checkbound():
    global boxsize
    if mouse.xcor() > boxsize:
        mouse.goto(boxsize,mouse.ycor())
    if mouse.xcor() < -boxsize:
        mouse.goto(-boxsize,mouse.ycor())
    if mouse.xcor() > boxsize:
        mouse.goto(mouse.xcor(),boxsize)
    if mouse.xcor() < -boxsize:
        mouse.goto(mouse.xcor(),-boxsize)

window = turtle.Screen()
mouse = turtle.Turtle()
cat = turtle.Turtle()
mouse.penup()
mouse.penup()
mouse.goto(100,100)

window.onkeypress(up,"Up")
window.onkeypress(left,"Left")
window.onkeypress(right,"Right")
window.onkeypress(back,"Down")
window.onkeypress(quitTurtles,"Escape")

difficulty = window.numinput("difficulty","Enter a difficult from easy (1),for hard (5) ",minval=1,maxval=5)

window.listen()
while not caught:
    cat.setheading(cat.towards(mouse))
    cat.forward(8+difficulty)
    score = score+1
    if cat.distance(mouse) < 5:
        caught = True
    time.sleep(0.2-(0.01*difficulty))
window.textinput("GAME OVER", "Well done.You scored:" + str(score*difficulty))
window.bye()
